Carl wirth



C. WIRTH,

PUMP. APPLICATIQN FILED SEP?. 2s` 191s.

Pi-eme@ June l?, i919.

CARL WIRTH, 0F ROCHESTER, NEW YORK.

PUMP. j i

To all whom 'it may cof/wem:

Be it known that I, CARL WnriH, a citizen of the United States, and resident of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Pumps, of which the following is a specification.

The present invention relates to pumps and more particularly to the type in which the compression chamber or chambers are formed from sheet metal tubes, and a cap is secured to the end of the tube with a piston rod operating through a packing in such cap. An object of this invention is to provide a construction in which an airtight joint between the cap and the tube is obtained in a simple and inexpensive manner. Another object of the invention is to provide a simple construction in which the introduction of the piston into the compression tube is facilitated.

To these and other ends the invention consists of certain parts and combinations of parts all of which will be hereinafter described, the novel features being pointed out in the appended claims.

In the drawings i Figurel is a side view of a triple cylinder air pump in which the present invention is embodied, parts being shown in section;

Fig. 2 is an enlarged plan view of the cap end of the pump with parts broken away; and

Fig. 3 is an enlarged section through the upper portion of the pump shown in Fig. 1.

The invention is herein illustrated in a hand air pump which embodies three compression tubes or chambers 1, 2 and 3, the tubes being of different sizes in cross-section, and being connected together at their Vlowei ends by a foot-piece 4 provided with an outlet opening 5 communicating with the cylinder tube 3, and also with a port 6 establishing communication between the lower ends of the cylinder tubes 1 and 2. The upper ends of the cylinders 2 and 3 are connected by a member or casting 7, surrounding said cylinder tubes, and preferably brazed to the latter, said casting having a port 8 providing communication between the upper ends of the cylinders 2 and 3. A cap plate 9 is secured by bolts 10 to the member I7, and has the, piston rods 11, 12 and 13 for the respective compression tribes 1, 2 and 3 guided therethrough.- @n

ASpecification of Letters Patent.

Patented .nine it, ima.

I Application iled September 25, 1918. Serial No. 255,667.

these piston rods pistons 14, 15 and 16 are secured, said pistons, in this instance, being of cup formation, thel cupped sides of the pistons 14 and 16 being disposed toward the foot-piece, while the cupped side of the piston 15 is disposed toward the cap 9. A handle 17 connects the three piston rods 11, 12 and 13l so that they may be reciprocated simultaneously. With the lowering movement of the handle 17, air is drawn through the port 18 in the cap plate 9 into the cylinder 1 above the piston 14. Upon the upward movement of the piston, the air above the latter passes beneath said piston, so that, upon the downward movement of the piston 14, such air is forcedthrough the port 6 into the cylinder 2 and passes the piston 16 to the upper side of said piston 15. Upon the upward movement of the piston 15 the air is forced through the port 8 into the cylinder 3 and passes the piston 16 through the outlet 5. A pump operating on this principle is old and no claim to this general operation isl herein made.

' A feature of this invention is the flaring of the upper ends of the cylinders 1, 2 and 3 as at 19. By this fiaring the introduction of the pistons 14, 15 and 16 into the compression tubes or cylinders is facilitated. When the pistons are of cup formation, great ditliculty has been experienced in introducing such pistons into cylinder tubes, especially, when three of such pistons are connected together in such a manner that they must be practically introduced simultaneously. The flaring of the upper ends of the tubes overcomes this objection.

Another disadvantage in pumps of a multi-cylinder type is the difficulty of securing an air-tight connection between the cap plate and the compression tubes. This disadvantage is overcome in this invention by providing the cap plate 9 with two tapered projections or bosses 2O and 21, adapted to project, respectively, into the flared ends of the compression tubes 2 and 3. Ile-` tween the tapered projections 20 and 21 and the flared ends of the cylinder tubes 2 and 3, packings 22 and 23 are introduced, said packings being prefer'v bly in the form of cone-shaped rings. Itis a" parent that these' packings may be clampe tightly between the tapered'ends of the compression tubes 2 3 and the tapered projections 2.0 and 21, the' cap plate 9 acting as a stop or' abutment 'which will limit the movement of the packings on the-tapered projections 20 and 2l, and the casting 7 acting to Support the flared portions externally. These tapered projections also may be utilized for conta-11b ing the packing for the piston rods 12 and 13 and to this end each of' said projections is provided with a pocket which is interiorly threaded and contains a packing 2i. Vith the interior threads an externally threaded packing collar 25 is engaged in order to force the packing firmly about the piston rod.

From the foregoing it Will be seen that there has been provided a structure in which the introduction of' a plurality of pistons simultaneously into a number of compression chambers is facilitated, this result being secured by flat-jing the upper ends of' the cylinders `to permit the ready entrance of' the pistons. These flared ends also serve as packing seats for packings which are forced against said seats by tapered projections on a cap plate, such tapered Vprojections also acting to contain packings for the piston rods. t

What I claim as my invention and desire to secure by Letters Patent is l, A pump con'lprising a sheet metal compression tube formed with a flared end providing a packing seat, a member brazed to the flared end of' the tube and supporting said flared end externally, a cap detachably secured to Vsaid member and provided with a tapered projection fitting in said flared end, said cap having its top Wall provided with a pocket extending into said projection, a piston rod extending through said projection and about the rod, and a packing between the tapered end of the compression tube and the tapered projection on the cap.

2. A .pump comprising a compression tube having a flared end, a detachable cap closing said end and having a tapered projection eX- tending into the flared end, a packing interposed betweenV said tapered projection and said fiared end, a piston rod operating through the cap, and a piston carried by the rod and adapted to be fitted into the compression tube through the flared end.

3. A pump comprising a compression tube, a detachable cap closing one end of the tube and formed with a tapered projection extending intorthe tube and also formed With a pocket in its outer wall extending into the tapered projection, a piston rod operating through the projection and the pocket, a packing' in the pocket about the rod, and a packing between the tapered projection and the end of' the compression tube.

CARL WIRTH.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents:

Washington, 11C.

pocket, a packing 1n the pocket 

